Vulnerability-Lookup

CVE-2026-71969 (GCVE-0-2026-71969)

Vulnerability from cvelistv5 – Published: 2026-08-10 18:18 – Updated: 2026-08-17 19:00 X_Open Source

Title

OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations

Summary

OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD encrypt and decrypt operations within the mbedTLS software backend and SE050 hardware driver that allows a malicious Trusted Application to corrupt secure-world heap memory by supplying an input length exceeding the RSA modulus size. When src_len exceeds rsa_len, the subtraction expression wraps to a large unsigned value, causing a subsequent memcpy to write attacker-controlled data before the destination buffer in S-EL1 secure-world heap memory.

Severity

8.4 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

6.7 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-10 19:47 UTC

CWE

CWE-787 - Out-of-bounds Write
CWE-124 - Buffer Underwrite ('Buffer Underflow')

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://blog.secmate.dev/posts/optee-vulnerabilit…	technical-descriptionexploit
https://github.com/OP-TEE/optee_os/pull/7898	issue-tracking
https://github.com/OP-TEE/optee_os/pull/7808	issue-tracking
https://github.com/OP-TEE/optee_os/commit/7b8b494…	patch
https://www.vulncheck.com/advisories/op-tee-os-bu…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
OP-TEE	optee_os	Affected: 0 , ≤ 4.10.0 (semver) Unaffected: 7b8b494e0a324cefec8ed386b7de413b44f1aaf3 (git) cpe:2.3:o:op-tee:op-tee_os::::::::

Date Public

2026-07-30 00:00

Credits

Ramtine Tofighi Shirazi (Secmate.dev) Argus Systems - ByteRay Ltd.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-71969

Vulnerability from fkie_nvd - Published: 2026-08-10 19:17 - Updated: 2026-08-17 19:16

Severity

6.7 (Medium) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://blog.secmate.dev/posts/optee-vulnerabilities-disclosure/
	disclosure@vulncheck.com	https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3
	disclosure@vulncheck.com	https://github.com/OP-TEE/optee_os/pull/7808
	disclosure@vulncheck.com	https://github.com/OP-TEE/optee_os/pull/7898
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "HIGH",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-71969",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-10T19:47:42.914421Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-10T19:17:32.400",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://blog.secmate.dev/posts/optee-vulnerabilities-disclosure/"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/OP-TEE/optee_os/pull/7808"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/OP-TEE/optee_os/pull/7898"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-124"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-HG7C-PMH6-576F

Vulnerability from github – Published: 2026-08-10 21:32 – Updated: 2026-08-17 21:31

Details

Severity

6.7 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

8.4 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-71969"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-124"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T19:17:32Z",
    "severity": "HIGH"
  },
  "details": "OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD encrypt and decrypt operations within the mbedTLS software backend and SE050 hardware driver that allows a malicious Trusted Application to corrupt secure-world heap memory by supplying an input length exceeding the RSA modulus size. When src_len exceeds rsa_len, the subtraction expression wraps to a large unsigned value, causing a subsequent memcpy to write attacker-controlled data before the destination buffer in S-EL1 secure-world heap memory.",
  "id": "GHSA-hg7c-pmh6-576f",
  "modified": "2026-08-17T21:31:13Z",
  "published": "2026-08-10T21:32:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71969"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OP-TEE/optee_os/pull/7808"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OP-TEE/optee_os/pull/7898"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3"
    },
    {
      "type": "WEB",
      "url": "https://blog.secmate.dev/posts/optee-vulnerabilities-disclosure"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

ubuntu-cve-2026-71969

Vulnerability from osv_ubuntu

Published

2026-08-10 19:17

Modified

2026-08-10 19:17

Summary

Details

Severity

6.7 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

8.4 (High)


                    
                      CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-71969	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-71969	REPORT
	https://github.com/OP-TEE/optee_os/commit/7b8b494…	REPORT
	https://github.com/OP-TEE/optee_os/pull/7808	REPORT
	https://github.com/OP-TEE/optee_os/pull/7898	REPORT
	https://www.vulncheck.com/advisories/op-tee-os-bu…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "optee-os",
            "binary_version": "4.8.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "optee-os",
        "purl": "pkg:deb/ubuntu/optee-os@4.8.0-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.7.0-1",
        "4.8.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD encrypt and decrypt operations within the mbedTLS software backend and SE050 hardware driver that allows a malicious Trusted Application to corrupt secure-world heap memory by supplying an input length exceeding the RSA modulus size. When src_len exceeds rsa_len, the subtraction expression wraps to a large unsigned value, causing a subsequent memcpy to write attacker-controlled data before the destination buffer in S-EL1 secure-world heap memory.",
  "id": "UBUNTU-CVE-2026-71969",
  "modified": "2026-08-10T19:17:00Z",
  "published": "2026-08-10T19:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-71969"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-71969"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OP-TEE/optee_os/pull/7808"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OP-TEE/optee_os/pull/7898"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-71969"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-71969 (GCVE-0-2026-71969)

FKIE_CVE-2026-71969

GHSA-HG7C-PMH6-576F

ubuntu-cve-2026-71969

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour